Apparatus for handling forms



Margh 4, 1958 c. l. WILLIAMS 2,325,115

APPARATUS FOR HANDLING FORMS Filed June 27, 1951 v 3 Sheets-Sh eet 1 mger z/ zzzzam March 4, 1958 c. l. WILLIAMS 2,825,115 V APPARATUS FOR HANVI'DLING FORMS Filed June 27, 1951 3 Sheets-Sheet 2 fasferj 3 Sheets-Sheet 3 March 4, 1958 v I c. 1'; WILLIAMS 7 APPARATUS FOR HANDLING FORMS Filed June 27, '1951 United States Patent APPARATUS FOR HANDLING FORMS Chester 1. Williams, Grand Rapids, Mich.

Application June 27, 1951, Serial No. 233,853

1 Claim. (Cl. 25-131) This invention relates to concrete forms, and more particularly, relates to an apparatus for handling concrete forms which permits the erection of concrete forms in a minimum of time. This invention is a continuationin-part of the invention disclosed and claimed in my copending application Serial No. 233,851, filed June 27, 1951 for Dummy She-Bolts.

Prior to my invention, concrete forms after each pour were usually raised'with a derrick crane,or other forms of mobile cranes having very long booms, and then held in place until the forms were relocated and affixed in position for pouring the next lift of concrete. Another method of erecting forms was to place an auxiliary cons'truction adjacent to the large blocks of concrete to be poured and the forms lifted, using the auxiliary support for maintaining the forms in position, .after which the raised forms were-located in position using the auxiliary forms as reinforcing.

It is therefore a principalobject of my invention to provide an improved and simplified form construction and apparatus for lifting the forms in place so that in forming huge blocks of concrete, such as are poured in dams, the forms may be erected in a minimum of time, and with a minimum amount of equipment which is very portable and may be manually carried about, and may be relocated easily and erected in position for lifting the forms after the concrete has been poured and set.

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Another object of the invention is to provide a portable form of lifting means which may be arranged with respect to the concrete form so that the form handling devices may be operated simultaneously either by hand, or otherforms of power supplied to the hoist of the devices, so that the entire'form may be uniformly lifted, after which it may be retained in position until relocated and affixed to'the concrete block being poured.

, In order to accomplish the above objectsrof my invention, I have provided a simple form construction which utilizes dummy she-bolts and ordinary she-bolts, together withlevelling jacks, for afiixing and adjustingthe form with respect to the face of the block being poured.- 'As the forms are relocated for pouring successive lifts together with simple form handling devices or lifting means which are portable, and may be readily carried from one position to another by the erecters on the job for raising the forms and holding them in position while the forms are secured in. erected position and affixed to the face of the blockbeing poured. This simple form of lifting means is particularly, adapted for lifting cantilever type of concfrete forms, although it is equally adaptable for other types of forms, andparticularly where the weight of the form may be distributed through several of the simple lifting means erected contiguous to the form for raising it to its next higher, position. I have also provided a simple form of anchoring means for anchoring the portable lifting means in position for raising or lowering the forms, after which the anchoring means may be left within concrete as the next successive layer or lift is poured.

1 In order to erect the cantilever type of form to the face of the block being poured, I prefer to use the dummy Which-replaces the dummy she-bolt for aflixing the form Another object of the invention is to provide an improved form of dummy she-bolt construction in combination with anchoring means which will permit the ready removal of the she-bolt, and the raising of the forms, after which an ordinary she-bolt may be attached tothe anchoring means, and the forms levelled ready for the next pouring, in combination with a simple portable lifting or hoisting mechanism which may be positioned adjacent the face of the concrete being poured for lifting the form while the dummy she-bolts are being removed and replaced by ordinary she-bolts.

Another object of the invention is to provide an improved portable lifting means in combination with anchoring means which may be precast in the concrete to provide an anchor for the lifting means.

A still further object of the invention is to provide simple anchoring means, which may be inserted within the concrete at the top of the lift before the concrete has entirely ,set, to extend above the upper'face of the poured lift to provide an anchor for any supporting means which may be attached thereto in the erection of forms, or in the pouring of concrete, and which may, after use, be left in position, with the next lift being poured thereover.

Another object of the invention is to provide a simple lift construction which may be readily attached to, and detached from, the forms, and readily connected to anchoring means placed in predetermined relationship to the studding on the concrete form for successive erection of the forms as the different lifts of concrete have been poured and set.

she-bolt construction, together with the ordinary she-bolt to the face of the block being poured, and which is particularly adaptable for the erection of cantilever type of forms, This particular form of construction is disclosed and claimed in the above-mentioned co-pending application.

Many other objects and advantages of the construction herein shown and described will be obvious to those skilled in the art from the disclosure herein given.

" t To this end, my invention consists in the novel construction, arrangement, and combination of parts herein shown and described, and more particularly pointed out inthe claims.

In the drawings, wherein like reference characters represent like 01 corresponding parts:

Fig. 1 is a vertical, sectional view in side elevation illustrating the erection of a concrete form using a portable form handling device in combination with a cantilever type form and improved anchoring means for anchoring form handling device with the hoisting cable removed;

- Fig. 4 is a side view of the upper end of the hoist I illustrating the pulley of the hoist and the anchoring means for the tension member for holding the hoist in erected position;

Fig. 5 is an enlarged, plan view of the upper end of the form handling device, illustrating the pulley construction and bracing for the frame;

Fig. 6 illustrates an embodiment of an anchoring means for the form handling device shaped in the form of a hairpin;

Fig. 7 a rviewsin, side elevationeof Fig. 6 showing 3 the undulating, longitudinally extending anchoring deformations of the anchoring means; and

.Fig. 8 is a modifiedform of anchoring means in the form of apigtail anchor having longitudinally extending,

laterally displaced undulations, and provided'with' means for affixing supporting members thereto.

Referring now to the drawings, particularlyFigs. 1, 2, and 3, there will be described the method of erecting cantilever type forms, andthe apparatus used in conjunction therewith. A cantilever type concrete form construction 10, including sheathing lland strong back 12, is shown as being erected on the peripheral faces of a concreteblock construction 13 such as is used in dam construction. For an ordinaryconcrete form construction where large lifts of concrete are being cast, the relative size of'the strong back is substantially 12 by 12", and the sheathing is made up of members 4".in thickness. The relative lengths of these cantilever type forms as they are erected may range up to 25 or even to 50 feet in length, and the spacing between the strong backs is usually six feet. The particular method of erecting the forms as illustrated in Figs. 1 and 2'hns been particularly illustratedto showthe form handling devices for raising the forms when pouring successive lifts, or layers, one upon the other. The forms may he usually erected in the ordinary manner, starting 'fromflbedrock, and pigtails or tie rods may be anchoredin place in the bedrock, in the ordinary manner, to which thetorms are mounted, and the necessary bracing applied for erecting the form for the first pouring.

Fig. l, for, example, illustrates the method of this invention in which the concrete form is illustrated after the firsrlittylc has been poured and allowed to.set, and after which a second lift 15 has also beenpoured and set and the form has been lifted, for example, from the position A, as shown'in the lower right hand portion of Fig. 2, to the position B shown in the top left otFigJZ. Priorto this, the dummy she-bolt 16, as illustrated in Fig. -l, was set in the. form so that its tapered end 17 extends through'the form tothe position shown, and to which a pigtail anchoring'means 18 is'complementally threaded into the corresponding threaded portion of the dummy she-bolt. The tapered end of the dummy shebolt, after it was removed from the concrete, left a tapered opening 19 in the concreteslab which was later recemented. This tapered opening 19permits the insertion of the tapered end 20 or an :ordinary tapered she-bolt con-' struction 21 as the relativetaper' of the dummyshe-bolt is greater than that of the ordinary she-bolt. This provides for the easy insertion of the regular she-bolt'so that it may be attached to the threaded end of the pigtail anchor 18, which has been cast in place with the threaded end extending into the enlarged tapered opening 19 left by the removal of-the dummy she-bolt. The particular form of the dummy she-bolt construction is disclosed and claimed in the aforementioned co-pending application, and need not be further described in connection with the method of erection of this application.

The concrete form 10 is then raised by hoisting means.

22 fromdhe position A to that of position B as illustratedin Fig. 2, and while suspended in position B, the regular she-bolts 21 are placed through the concrete form into the enlarged tapered openings 19 provided by the dummy she-bolts 16 in the poured and set concrete. The regular she-bolt 21 is aifixed tothe threaded end of the pigtail anchor 18 by attaching a wrenchto the squared end of the. she-bolt, and firmly threading the she-bolt in position on the threaded end oftheanchoring means 18.. The bracket 23 and adjustingnut 2'4 nre then threaded uponthe she-bolt, clamping the tcrm'against the face of the cast block l3, after which the doubleheadeduails 25 may be driven through holes provided in the bracket 23 to affix the bracket in position'npon the strong back of the form. V p p g An adjusting omitting jack 36 isalso mounted cit-the end of the strong .back, havingxa threaded bracket 27 abutting the rear face of the strong back, whereas a base 28 of the jack abuts. the frontface of the cast concrete block. This same construction of the regular she-bolt and adjusting jack is provided at frequent intervals across the width ofthe form, as shown in Fig. 2, and provides the support for the form when erected in place and concrete is poured against the form. The forms are leveled by adjusting the jack 26 through a squared end 29 and by rotating the shaft of .the jack in ,the required direction. After making the necessary adjustments so that the form is correctly aligned, the adjusting nut 24 is firmly secured to'take thethrust of the concrete when poured against the form. With the usual she-bolt construction and anchoring means, the pigtail thereof will develop approximately a 35,000 pound pull in each anchor under test, whereas the actual load usually is approximately 17,000 pounds,so thatthere is a sufiicient factor of safety. I,

In a form construction erected in the manner described, it is possible to work along the sides of the form preparing the surface of concrete for the next pour with a great deal of freedom,"since by using this type of form construction, it is not necessary to place the anchoring means for the next pour until just ahead of the pouring operation. This has been made possible by the dummy she bolt construction of the aforementioned invention of my co-pending' application, and utilized in connection with the disclosure of the method of erecting forms of this invention. Asthe vertical spacing for the location of the she-bolt has been predetermined when the forms have been fabricated, all that is necessary is for the dummy she-bolts 16 to be set. in the form, as illustrated in *Fig. 1 and as illustrated in positions A and B of Fig. 2. The she-bolt 16. may have thepigtail anchor 18,

attached thereto for erecting, and the she-boltand pigtail anchor-inserted through holes previously drilled in the form, orthe dummyshe-bolt may be erected from the outside of the form and thepigtail anchors mounted there in from the inside of the form.

A support bracket 31 for mounting the dummy she-bolt 16 is shownmounted contiguousto the opening through the form, and is nailed inposition by double-headed nails 25, as shown in Figs. land 2. The bracket 31 has an arcuate,"struck-out portion from the bracket which provides an opening for-the dummy she-bolt 16 as the bracket 31 abuts thefacc of the strong back 12. The arcuate, struck-out portion 32 is also provided with an opening for the passage therethrough of the dummy she-bolt 16. The dummy she-bolt is held in position with respect to the bracket 31 by a pin 34 inserted through a complementally formed hole in the dummy'shebolt. The pin 34 is pointed at one end for inserting the pinthrough a hole in the she-bolt. The she-bolt is provided at its outer-end with a squared end for rotating the shc bolt for detachably connecting itto the pigtailanchoring means 18 by the complementally formed; threaded portions thereof. The particular construction of the dummy-'she-bolt is disclosed and claimedin the'aforesaid co-pending application, and has been disclosed herein in connection with the method of erecting concrete forms using 1a simple A-frame type of form handling device 22. There is illustrated a scafiolding :C for meeting and removing. the she-bolts. Asimple: scalfolding has been shown suitably protected with a guard, nndt suppcrted from the strong backs of the form. Any other ,simple form of scatfolding may. be used if itis found necessary to provide a support for the --workersin. erecting the. forms, especially for.positioningthe shc-bolts,.a.nd in aligning the form.

,Usualiyth'e bracket 31. is assembled to the dummy she-bolt l6, and the pin 34 mounted to latch the bracket 'tothe -she-bolt, so that in the erection on the form, the assembled pin,-br-acket, and she-bolt may be readily mounted on the form by the insertion of-the dummy she-bolt within the holes provided in the form, after which the bracket is nailedinposition, using the doubleheaded nails 25, permitting ease of removallater. As the assembled she-bolt and anchoring means are inserted and erected in place on the outside of the form, they may be suitably aflixed together; but if it is desirable, because of working conditions, to assemble the dummy she-bolt from the outside of'the form, and the anchor means from the inside of the'fo rm, they may be readily is applied securing the dummy she-bolt in relative position with respect to the form.

Referring to Figs. 1, 2, and 3, a simple form of A-frame form handling device adapted for raising cantilever forms or other types of forms will be described.

The form handling device 22 is shaped in the form of' an A-frame having channel-shaped frame members or legs 37 and 38 adjoined at the upper end by a pin 39 extending through plate members 40 and 41 and base of the channel-shaped members forming the legs 37 and 38, shown in Figs. 4 and 5. The legs 37and 38 may be formed fro-m pipe-shaped members or angle iron members. *The upper'ends of the A-frame 22 is spaced apart to provide an opening for mounting a sheave 42.

Plates 43 are also welded or otherwise secured to theangle channel-shaped or iron legs 37; and 3 8, and to the plate members 40 and 41, to provide ajsupport for a pin 44 upon which the sheave 42'is journaled. The plate members 43, formed as shown in Fig. 4, provide a support for a pin 45 'to which is attached a cable or tension member 46, Fig. 1.' The hoisting mechanism 47 is mounted upon aplate member 48 which is welded, or otherwise suitably affixed, to upper and lower cross angles 49-and 49' afiixed to the legs 37 and 38. -An

additional pipe brace 50 is afiixed between the legs 37 and 38 to provide an additional bracing for the A-frame. The hoisting mechanism 47 may be any suitablewindlass-type of mechanism, or other form of hoist mounted on brackets 48' affixed to the plate member 48, and'it may be hand-operated or power-operated, depending upon the availability of power where the form handling device is used. For the purpose of disclosure of this invention, 'there has been disclosed a handoperated hoist driven through a crankhandle 51, which i's connected to a suitable reducing gear mechanism for actuating a reel 52 of the winch to which a lifting cable 53 is affixed at one end, wound upon the reel, and extends over the sheave 42, and is connected to a lifting hook 54. A suitable ratchet and pawl mechanism allows the hoist to be secured in any adjusted position.

The cable or tension member 46, which is affixed at its upper end to the pin 45, and secured by a suitable clamp 55, is of such a length, as illustrated in Fig. 1, that it' extends a sufficient distance behind the form handling device 22 to position it in such manner that the hook 54 will extend over the form to be raised, and may be aflixed at its rear end to an anchoring means 56 in the form of a hair-pin, as illustrated in Figs. 6 and 7. .The anchoring means 56 is positioned in the concrete so that the mid-portion thereof extends above the top of the lift to enable a hook'57 to engage the this tension rod may have -therein a turnbuckle adjust.-

ment such as illustrated at 58 in the connection for, the tension member supporting the scaffolding C. It is also to be understood that it is within the scope of the invention that an adjusting cable 46 may be used in connection with the form handling device, and operated by adjusting mechanism similar to the hoisting mechanism 47 for adjusting and securing the A-frame handling device 22 in its adjusted position. When used in this manner, a suitable sheave would be mounted on the pin 45 over which the cable 46 would extend to be attached to a separate adjusting hoist similar to that described in connection with the hoist 47, but the size thereof depending upon the stress within the cable 46 in view of the load of the'concrete forms.

Referring to Figs. 1 and 3, the lower ends of the channel-shaped legs 37 and 38 are provided with pointed members 59 which may be hardened for penetrating the upper surface of the lift to sufficiently indentate the surface of the concrete to prevent slippage of the hoist during the lifting operation.

Referring to Figs. 6 and 7, the legs 60 of the hairpinshaped anchoring means 56 are provided with longitudinally extending undulations, as illustrated in Fig. 7. The'undulations are laterally deformed with respect to the axes of leg portions substantially within the range of from greater than the thickness or diameter of the rod forming the hairpin, but less than twice the diameter thereof. This permits concrete to flow readily about the hairpin when embedded within the concrete, so that no voids are formed to reduce the holding power of the hairpin within the concrete. The shape of the hairpin legs permits ease in insertion of the hairpin within the poured concrete before it has finally set, so that the anchoring means may be readily located with respect to the strong backs of the form construction, and at the preferred distance back of the form, to correctly locate the form handling device. Althoughthe hairpin 56 is illustrated as being vertically forced into the concrete, it is to be understood that it may be inclined at an angle substantially the same as that taken by the tensioning member 46. 1

Referring to Figs. 1 and 8, there is also illustrated another form of anchoring means 61 in the shape of a pigtail anchor, the upper end of which is threaded at 62, to which a forged or cast eye 63 may be readily affixed for attaching the hook 57 of the tension member 46. The undulations formed on the pigtail anchor 61 are shaped similarly as those on the legs of the hairpin anchoring means. This type of pigtail anchoring means also permits ready insertion within the poured concrete prior to its final setting, after which the concrete may be suitably puddled in place about the pigtail anchor. The anchoring means 56 and 61 constructed in this manner obviously permits of developing the maximum strength of the anchoring means within the concrete to provide a pointof connection of the tension member 46. Either form of anchoring means may be used without departing from the scope of this invention, and after they have been used for elevating the forms, the concrete is poured thereover, embedding the anchoring means in the manner illustrated in connection with the anchoring means 61, Fig. 1. In the embodiment shown in Fig. 8, the eye 63 may be salvaged. It is also within the scope of the invention that an eye may be integrally forged on the pigtail anchor.

Referring to Figs. 1, 2, and 3, when it is desired to lift the concrete forms from the position A to that of position B, shown in Fig. 2, the form handling devices 22 are located over their respective strong backs 12, as illustrated in the lowermost position A of the form, and a suitable number of form handling devices are used, dependingv upon the size of the concrete form.- Since the average form may vary up to twenty-five feet in length, and even to fifty feet in length, the number of form handling. de

. 7 vices chosen, and size thereof, would depend .uvon' h relative weight of .thetorm. Theqlength, of the form handling device would depend upon,,the.;height of th form required for pouring, for .examplciafifi foo i t- Such a form is approximately nine-feet hig .tOPPIQYidQ overlapping. of the previously poured :lifhand, to provide space for the mountingof the lifting jacks 2,6as shown. Form handling devices .constructed as described, above have substantially two ton capacity;,areapproximately ten feet in.overa1l height; and. the spacing ofthe legs is substantially four feet to provide suitable. bracing. The bottom end of the A -frame .is placed preferablywnot more than half the heightof the .A-frameto therear of the form to provide a suitable mount,;and the cable v46 is attached to the anchoring means; 56 or61'substantially as shown in Fig. 1. The hook 54 is attached to a suitable hanger 64 aflixed to the upper end. of .a strong back 12 the form is raised to the heightshown by the position B.

of Fig. 2 by operating the hoist 47 of the .several form handling devices 22 through. their crank handles 51. A suitable ratchet mechanism of the form handling device permits'each hoist 47 to be latched, securing theiformin its final, erected position, as shown in Fig. Lsvhercupon the ordinaryshe-bolts 21 which have been removed from their position, shown in position A :of- Fig. 2, and shall .be inserted in the tapered holes l9 left by theidummy shebolts 16, as shown in solid lines of position 13, Fig. 2. This is illustrated in Fig. 1. The form is leveled and secured in adjusted position as previously describedabove, and as also particularly disclosed and claimedtin the aforementioned co-pending application.

With the form 10 raised to the position shown in Fig. l, and to the dotted position A shown in Fig. 2, the concrete form .is then in alignment with. a similar concrete form which has been raised to the LPOSillOItBeShOWIl in Fig. 2. Contiguous upperends of strong backs 12' and 12" are then suitably affixed together by bolting or clamping, and the forms aligned. In the raised position.

shown in Fig. ,1 and position B of Fig. 2, the cable 53 is then released,.and the hook 54 of each of the hoists is removed from its corresponding hangers 64. The hoist 22 may then be rotated, rearwardlygfromthe-position shown in Fig. l, permitting the detachment of the book 57 from its corresponding anchoring means 5 6-or 61. The form handling devices 22 may then be stored to one side or carried to the next location where the form is to be raised in order to use a minimum number .of .form handling devices to raise the forms, for example, in casting a large concrete block as used in dam work. Also, a sufficient number for all of the forms, since they are relatively cheap, maybe used without the need of transporting them from one position to another, but positioned or stored adjacent the forms whichjare to be raised by this simple type of form handling device.

Although the form handling devices 22 have been described as being hand-operated, using the crank handle 51 for actuating the lifting winch 47, it is possible to have each of the'hoists power-driven, such as by a portable air motor, if such a source of power 'is available-or to suitable electric motors connected to the shaft for actuating the hoist so that, if desired, each of the hoists connected to a particular form may be simultaneously actuated to evenly lift the form from the lowermost pos'itionA shown in Fig. 2, to its next erected position B, Fig. 2.

After the forms have been raised forpouring, the next lift is adjusted. and alignedinrm tm forxxample. in pouring a huge block for concrete darn work, the

sur ace 1 the ift; is sui alzlvc eancd and; the term n dling de ic mo ed to. de. si a hi h b ummy h -bol s 16. and. ;tlt -p stail;anqh9rs18 or ctlitrs ita le nchoring mean may be mou ted a h u en Oi hctq mt as. shown in :Eissnd 2- The concre s he poured toia. pre et rmine lc cli as in ic ted by h nourins ine W th. his nar icu m mile r o onstwstiQmJh dummy sh e l co s uction. p rm ts he r t on ot th n s ailttyn .of ammonia; mea ius ahead of the pouring. with this irnprove d fiorm of she b c m tiomitis her ore Poss e t Po r a ea amoun of co cr te. han ha e e of e b e DQ5321 1 ce th this-i proved method of liftin u n a imp "p r ble form hand in de ce a low the to ato be easilyerected andleveled.

A ter th pou e lay r at g era h s et f he quired, periodr he ummy she-bolts are en e o by first detaching the pin 34, and unscrewing the dummy she-bolt from the threaded end of the anchoring means. The brackets 31 are then detached, and the she-bolt and bracket and pin are reassemble-altogether to prevent misplacement of the parts so that. they may be readily assembledwhen the, next layerispoured after the forms have been raised and releveled. This has becnparticw larly described with respect to the raising of the'form from the position A to the position B, shown in Fig. 2. Removal of the dummy she-bolt ,with its enlarged. t3- pered end provides the enla flfid, tapered opening 19, as described above, so that an ordinary she-bolt 21 may then,be assembled in theopening left by the dummy shebolt, and threaded on to :thethreqded end of the anchormeans. 18 left bythe removal of the. dummy shebolt, as illustrated in Fig. 1. The ordinary She-boltis 1 then assembled andafiixed as described above, and the formsaligned. However, priorto the setting of the COD. e the an horin m ans a d .1 ha b en se in p e in t e oncrete nd. ra e or h lat r e tion f th f rm. han in devices 22.

Al ou h her h s ce n escri sd p r i ul r s e of c ncre fo m. an a pa i ul f m dl ns devi e forlifting the terms, the formsmay be of any desired,

length and height, and likewise, the form handling device may be so constructed as-to manipulate the particular form to which it is used. The forms are adapted to be dismantled and used repeatedly for pouring the concrete, or for the construction of vertical or .battered walls, and likewise, the form handling devices are equally adapted forany typeof wall.

It is thus obvious thatthere has been disclosed a .sim ple and inexpensive concrete form construction and dummy she -bolt construction, together with .a simple: form handling device and anchoringtmeans therefor, for .the rapid erection of concrete fo ms as the conctetefis being poured.

The improvedconcrete form construction and lifting means therefor work equally well on vertical .or battered walls, .or for erection of the forms directly to a. rock foundation. Theanchoring means 56 and 61, when used in this manner, are. positioned in drilled holes in which has beenplaced concrete to develop the ultimate strength of the anchoring means for securing a form handling device thereto.

In addition, there has been disclosed a simple form handling device for the operation of the method of this invention which is inexpensive to. make, and simple to operate, and very portable. It islalso to be understood that other modifications thereof may heused without departingrfnom the scope of my invention.

It is also-obvious that. there has been disclosed an improved method of forming huge blocks of concrete such as are poured on dam constructions today, when a slow setting, lowcompress'ionconcrete has been heretofore verydifiicult to use.

Having thus described my. nventionaitia obvious that various immaterial modifications may be made in the same without departing from the spirit of my invention; hence, I do not wish to be understood as limiting myself to the exact arrangement and method herein shown and described, or uses mentioned.

What I claim as new and desire to secure by Letters Patent is:

The combination with a concrete form construction including studding and sheathing therefor and detachable means comprising she-bolts and pigtail anchoring means for aflixing the concrete form construction to embedded pigtail anchoring means for mounting and positioning the concrete form construction, of hoisting means for raising and lowering the concrete form construction including a form handling device having lifting means, complementally formed means on the concrete form construction and lifting means for detachably connecting the concrete form construction to the lifting means, said hoisting means for raising and lowering the concrete form construction adapted to be supported contiguous to the concrete form construction as it is being raised or lowered, and means for anchoring the hoisting means for raising and lowering in said position contiguous to the concrete form construction, said means for anchoring including a tension member and a pigtail shaped anchoring device adapted to be integrally cast in place, said free ends of said tension member and said anchoring device adapted to be detachably connected, and said lifting means adapted for moving the concrete form construction to its successive position, whereby the concrete form construction is aifixed in its elevated position by the aforesaid detachable means, after which the means for raising and lowering may be removed, and the concrete which may be poured later embedding said anchoring device after it has been detached from said tension member.

References Cited in the file of this patent UNITED STATES PATENTS 556,082 Boeddinghaus Mar. 10, 1896 941,714 Jenckes Nov. 30, 1909 1,044,862 Crary Nov. 19, 1912 1,398,209 Van Bavegem Nov. 22, 1921 1,403,962 Jolly Jan. 17, 1922 1,411,733 Kimball Apr. 4, 1922 1,983,757 Hick Dec. 11, 1934 2,190,748 Williams Feb. 20, 1940 2,304,354 Harvey Dec. 8, 1942 2,355,874 Laird Aug. 15, 1944 2,390,929 Ellis Dec. 11, 1945 2,493,264 Records Jan. 3, 1950 2,534,154 Williams Dec. 12, 1950 

